Externos Internos Lesiones
Rhabdovirus
VHS
/IHN
Salmónidos Alevines 9-12ºC Lethargy, erratical swimming,
changes in pigmentation,
exophthalmia
Large number of
haemorrhages in skin,
muscles and viscera. Liver
pallor. Kidney enlargement
and pallor. Gill anemia
Damage in most blood vessels
(haemorrhages). Necrosis of the
haematopietic tissue. Focal
necrosis in the liver
SVC Ciprínidos Todos >11ºC Lethargy, erratical swimming,
changes in pigmentation,
anemia, swollen belly,
exophthalmia, external
haemorrhages
Oedema, anemia and pallor
in most organs. Enteritis and
fibrinous peritonitis. Large
number of haemorrhages in
muscle, viscera and
swimbladder. Gill anemia.
Damage in most blood vessels
(vasculitis and haemorrhages).
Congestion. Necrosis of the
haematopietic tissue. Focal
necrosis in the liver. Necrotic
enteritis
Birnavirus
IPN
1º
Salmónidos Anorexia, altered swimming
hyperpigmentation,
exophthalmia and
haemorrhages
Few symptoms:
haemorhages in internal
organs and mucous enteritis
(usually not seen)
Necrosis of the pancreatic acini and
necrosis of the haemopoietic cells
(kidney and spleen)
Alphavirus
PD Salmón Decrease in feeding, lose of
weight.
Necrosis and fibrosis of the
exocrine pancreatic tissue
SD Trucha Fish rest on their side on the
bottom. If disturbed, swim for
a time before resting again on
the bottom. Low mortalities
but fish stop eating for up to a
month with loss of growth.
Cardiac and skeletal
myopathy.
Orthomyxoviridae
ISA Salmón
atlántico
High mortality (acute form),
lethargy, anorexia, gill pallor.
Ascitis, liver congestion and
enlargement, petechiae in the
visceral fat.
Multifocal necrosis and
haemorhages in the liver.
Erythrocytes altered.
Nodavirus
VNN Sea bass,
sole and
other.
High mortality (acute form:
larvae and juveniles), nervous
behaviour, erratic swimming
spasmodic movements.
Swimbladder hyperinflation.
Hyperemic / congestive brain. Gliosis and neuronal necrosis in the
brain and medulla (occasionally
vacuolisation in the neuronal
cytoplasm). Blood vessels
congestion in the brain. Necrosis of
the retinal layer (fry and larvae)
